So I found dirt in my front diff case as arrma forgot to tighten screws from Bulkhead to chassis. My bearings where fine when I got it this winter and ran it no more than 10 times and now another 10 days. But I ripped everything apart and found all my bearings had lost grease and were rough. It makes no sense as I have a sealed tyranny and the output to the rear bearing was toast also. I thought sealed bearings were water resistant but thnk again. So to all running in water will kill your bearings. I even blew them out with compressor and dried by wood stove. Maybe arrma bearings are just not that good but it is most likely me.